1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef PCM_CONVERT_H
#define PCM_CONVERT_H
#include "pcm_dsd.h"
#include "pcm_resample.h"
#include "pcm_dither.h"
#include "pcm_buffer.h"
struct audio_format;
/**
* This object is statically allocated (within another struct), and
* holds buffer allocations and the state for all kinds of PCM
* conversions.
*/
struct pcm_convert_state {
struct pcm_dsd dsd;
struct pcm_resample_state resample;
struct pcm_dither dither;
/** the buffer for converting the sample format */
struct pcm_buffer format_buffer;
/** the buffer for converting to/from packed samples */
struct pcm_buffer pack_buffer;
/** the buffer for converting the channel count */
struct pcm_buffer channels_buffer;
};
static inline GQuark
pcm_convert_quark(void)
{
return g_quark_from_static_string("pcm_convert");
}
/**
* Initializes a pcm_convert_state object.
*/
void pcm_convert_init(struct pcm_convert_state *state);
/**
* Deinitializes a pcm_convert_state object and frees allocated
* memory.
*/
void pcm_convert_deinit(struct pcm_convert_state *state);
/**
* Reset the pcm_convert_state object. Use this at the boundary
* between two distinct songs and each time the format changes.
*/
void
pcm_convert_reset(struct pcm_convert_state *state);
/**
* Converts PCM data between two audio formats.
*
* @param state an initialized pcm_convert_state object
* @param src_format the source audio format
* @param src the source PCM buffer
* @param src_size the size of #src in bytes
* @param dest_format the requested destination audio format
* @param dest_size_r returns the number of bytes of the destination buffer
* @param error_r location to store the error occurring, or NULL to
* ignore errors
* @return the destination buffer, or NULL on error
*/
const void *
pcm_convert(struct pcm_convert_state *state,
const struct audio_format *src_format,
const void *src, size_t src_size,
const struct audio_format *dest_format,
size_t *dest_size_r,
GError **error_r);
#endif
|
